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Bristol police said a man armed with a gun jumped the counter at a Rite Aid on Summer Street and pointed the gun at a pharmacist. Investigators said they believe the man got away with tens of thousands of dollars' worth of drugs.

On Monday morning, a Fish and Game Department dog was brought in to see if the robber had left anything behind. The dog track took officers into the woods behind the pharmacy, corroborating what a witness saw.

"We did have a witness that was behind the building that saw him run through the wood line, but unfortunately, he was still wearing his full mask at that time," said Bristol Police Chief Michael Lewis.

Police said they do not believe the robber was acting alone.

"It is believed that the individual was picked up several hundred yards behind the building here at an adjacent business," Lewis said.

That business was the nearby Dunkin' Donuts, which was taped off Monday morning.

Surveillance video shows the robber just before he put on the mask. The man was described as white, about 5 feet 8 inches tall with a medium build. Police said they have some leads as a result of releasing the video.

Investigators said the robber made off with 1,100 Oxycontin pills. No one was hurt.

Two people who were in the area at the time of the robbery were arrested, but police said they were later cleared of any involvement. They are facing other unrelated charges.

Police said they want to hear from anyone who might have seen the man Sunday evening before he put on the mask.

Investigators said the search for the robber involves departments throughout the Lakes Region and into southern New Hampshire. They said they're also checking with other departments to see if they have had any similar robberies.